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Small nucleolar RNA SNORD22 Type: Gene; snRNA; snoRNA; CD-box; 2° structure: Predicted; PFOLD; Daub J Seed alignment: Griffiths-Jones SR, INFERNAL Avg length: 118.40 nucleotides Avg identity: 69.00% snoRNA U22 (also known as SNORD22) is a non-coding RNA (ncRNA) molecule which functions in the modification of other small nuclear RNAs (snRNAs). This type of modifying RNA is usually located in the nucleolus of the eukaryotic cell which is a major site of snRNA biogenesis. It is known as a small nucleolar RNA (snoRNA) and also often referred to as a guide RNA. U22 belongs to the C/D box class of snoRNAs which contain the conserved sequence motifs known as the C box (UGAUGA) and the D box (CUGA). Most of the members of the box C/D family function in directing site-specific 2'-O-methylation of substrate RNAs.[1] In the human genome snoRNA U22 is encoded along with seven other snoRNAs within the introns of the same gene (called UHG for U22 host gene) in mammals.[2] U22 has also been identified in the amphibian Xenopus laevis[3] U22 is predicted to guide the 2'-O-ribose methylation guide for ribosomal RNA.[3] References ^ Galardi, S; Fatica A, Bachi A, Scaloni A, Presutti C, Bozzoni I (2002). "Purified box C/D snoRNPs are able to reproduce site-specific 2'-O-methylation of target RNA in vitro". Mol Cell Biol 22 (19): 6663–6668. doi:10.1128/MCB.22.19.6663-6668.2002. PMC 134041. PMID 12215523.  ^ Tycowski KT, Shu MD, Steitz JA (1996). "A mammalian gene with introns instead of exons generating stable RNA products". Nature 379 (6564): 464–6. doi:10.1038/379464a0. PMID 8559254.  ^ a b Tycowski KT, Shu MD, Steitz JA (1994). "Requirement for intron-encoded U22 small nucleolar RNA in 18S ribosomal RNA maturation". Science 266 (5190): 1558–61. doi:10.1126/science.7985025. PMID 7985025.  External links Rfam page for Small nucleolar RNA SNORD22 snoRNABase entry for SNORD22 v · d · eSmall nucleolar RNA J 26 · 33 MB MBI-1 · MBI-28 · MBI-87 · MBI-161 · MBII-202 Me 18S-Gm1358 · 18S-Um1356 · 28S-Am982 · 28S-Am2589 · 28S-Am2634 · 28S-Cm788 · 28S-Cm2645 · 28S-Cm3227 · 28S-Gm1083 · 28S-Gm3113 · 28S-Gm3255 · 28S-U3344 psi 18S-841/snoR66 · 18S-1377 · 18S-1854 · 28S-1192 · 28S-2876 · 28S-3316 · 28S-3327 R 1 · 11/Z151 · 12 · 16 · 20 · 21 · 24 · 28 · 30/Z108 · 31/Z110/Z27 · 32/81/Z41 · 38 · 41 · 43 · 44/J54/Z268 family · 60 · R64/Z200 family · 66 · 71 · 72 · 79 · 105/108 · 160 SNORA 1 · 2 · 4 · 5 · 7 · 8 · 9 · 11 · 12 · 13 · 14 · 15 · 17 · 18 · 19 · 20 · 21 · 22 · 24 · 25 · 26 · 27 · 28 · 29 · 30 · 32 · 33 · 35 · 38 · 40 · 41 · 42 · 43 · 44 · 46 · 48 · 49 · 50 · 51 · 52 · 53 · 54 · 55 · 56 · 57 · 58 · 61 · 62 · 63 · 64/10 family · 65 · 66 · 67 · 68 · 69 · 70 · 71 · 72 · 73 · 74 · 75 · 76 · 77 · 79 SNORD 12/106 · 14 · 15 · 16 · 17 · 18 · 19 · 20 · 21 · 22 · 23 · 24 · 25 · 26 · 27 · 28 · 29 · 30 · 31 · 32 · 34 · 35 · 36 · 37 · 38 · 39 · 41 · 42 · 43 · 44 · 45 · 46 · 47 · 48 · 49 · 50 · 51 · 52 · 53 · 54 · 56 · 57 · 58 · 59 · 60 · 61 · 62 · 63 · 64 · 65 · 66 · 67 · 69 · 70 · 71 · 72 · 73 · 75 · 77 · 78 · 79 · 81 · 82 · 83 · 86 · 87 · 88 · 89 · 90 · 92 · 93 · 94 · 95 · 98 · 99 · 100 · 101 · 102 · 103 · 105 · 110 · 111 · 113 · 115 · 116 snR 48 · 53 · 54 · 55/Z10 · 57 · 60/Z15/Z230/Z193/J17 · 61/Z1/Z11 · 64 · 69 · 71 TBR 5 · 7 · 17 U 2-19 · 2-30 · 3 · U6-53/MBII-28 · 8 · 83B Z Z13/snr52 · 17 · 37 · 39 · 40 · 43 · 50 · 101 · Z102/R77 · 103 · 105 · Z107/R87 · 112 · 118/121/120 · 119 · 122 · Z152/R70/R12 · 155 · Z157/R69/R10 · Z159/U59 · 161/228 · 162 · 163/177 family · 165 · 168/174 · 169 · 173 · 175 · 178 · 182 · 185 · 188 · 194 · Z195/SNORD33 family · Z196/R39/R59 family · 199 · 206 · 221 · 223 · 242 · 247 · 248 · 256 · 266 · 267 · 278 · 279 other 296A/B · CD11 · F1/F2/snoR5a · Pyrococcal · M1 · sR8 This molecular or cell biology article is a stub. You can help Wikipedia by expanding it.v · d · e